The ACR "rifles" used smoothbore barrels to fire single or multiple flechette per round, rather than bullets, to provide long range, flat trajectory, and armor piercing abilities.
炮弹（抛射物）必须拥有稳定
外
，
带尾翼箭状物或球体，以此减小发射时震动。
The ACR "rifles" used smoothbore barrels to fire single or multiple flechette per round, rather than bullets, to provide long range, flat trajectory, and armor piercing abilities.
炮弹（抛射物）必须拥有稳定外，带尾翼箭状物或球体，以此减小发射时震动。
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